# Azure_MQTT_NUCLEO-L552ZE-Q_ESP8266_WiFi_FreeRTOS

**Repository Path**: mirrors_ARMmbed/Azure_MQTT_NUCLEO-L552ZE-Q_ESP8266_WiFi_FreeRTOS

## Basic Information

- **Project Name**: Azure_MQTT_NUCLEO-L552ZE-Q_ESP8266_WiFi_FreeRTOS
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-08-08
- **Last Updated**: 2025-11-22

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

Azure MQTT Demo
===============

This demo application connects to 
[Azure IoT Hub](https://docs.microsoft.com/en-us/azure/iot-hub/) 
through MQTT, sends messages and checks for receive confirmation.

It requires a registered [device](https://www2.keil.com/iot/microsoft) in the Azure IoT hub.

The following describes the various components and the configuration settings.

Once the application is configured you can:
 - Build the application
 - Connect the debugger
 - Run the application and view messages in a debug printf or terminal window


Azure IoT Client
----------------
The file `iothub_ll_telemetry_sample_mdk.c` configures the connection to 
Azure IoT Hub with these settings:
 - connectionString: Connection string - primary key

Note: These settings need to be configured by the user!


FreeRTOS Real-Time Operating System
-----------------------------------
The [FreeRTOS RTOS](https://github.com/ARM-software/CMSIS-FreeRTOS) 
implements the resource management. It is configured with the following settings:

- Global Dynamic Memory size: 24000 bytes
- Default Thread Stack size: 3072 bytes


WiFi IoT Socket
---------------
This implementation uses an IoT socket layer that connects to a 
[CMSIS-Driver WiFi](https://arm-software.github.io/CMSIS_5/Driver/html/index.html).

The file `socket_startup.c` configures the WiFi connection with these settings:
 - SSID:          network identifier
 - PASSWORD:      network password
 - SECURITY_TYPE: network security

Note: These settings need to be configured by the user!


ESP8266 WiFi Module
-------------------
The [ESP8266 WiFi Module](https://www2.keil.com/iot/shields/wrl13287) 
is connected via an Arduino connector using a USART interface.
It exposes a **CMSIS-Driver WiFi**.


STMicroelectronics NUCLEO-L552ZE-Q Target Board
-----------------------------------------------
The Board layer contains the following configured interface drivers:

**CMSIS-Driver USART6** routed to Virtual COM port (ST-LINK):
 - RX: ST-LINK-LPUART1_RX (PG8)
 - TX: ST-LINK-LPUART1_TX (PG7)

**CMSIS-Driver USART3** routed to Arduino UNO R3 connector (CN10):
 - RX: D0 USART_A_RX (PD9)
 - TX: D1 USART_A_TX (PD8)

**CMSIS-Driver SPI1** routed to Arduino UNO R3 connector (CN7):
 - SCK:  D13 SPI_A_SCK (PA5)
 - MISO: D12 SPI_A_MISO (PA6)
 - MOSI: D11 SPI_A_MOSI (PA7)

**GPIO** pins routed to Arduino UNO R3 connector (CN7):
 - output: D10 SPI_A_CS (PD14)
 - input:  D9 TIM_B_PWM2 (PD15)

**CMSIS-Driver VIO** with the following board hardware mapping:
 - vioBUTTON0: Button USER (PC13)
 - vioLED0:    LD3 RED (PA9)
 - vioLED1:    LD1 GREEN (PC7)
 - vioLED2:    LD2 BLUE (PB7)

**STDIO** routed to Virtual COM port (ST-LINK, baudrate = 115200)

The board configuration can be modified using 
[STM32CubeMX](https://www.keil.com/pack/doc/STM32Cube/html/index.html) 
and is stored in the file `STCubeGenerated.ioc`.